Smith machine capable of angle adjustment and swing

ABSTRACT

A Smith machine includes: a frame part formed to have an exercise space, and including vertical two-sided pillars, a horizontal beam for connecting upper ends of the two-sided pillars, and a support base formed in lower portions of the two-sided pillars; a swing part formed in the exercise space, hinged to the support base via a shaft member, and having a rack bar having a plurality of locking jaws such that the height of the barbell can be adjusted; a guide part which is integrally coupled to the swing part so as to swing together, and guides the rise or fall of the barbell; an angle adjustment part for adjusting the angle of the swing part; a barbell part coupled to the guide part so as to be raisable; and a load support part for supporting an inclination load of the swing part by elastic force.

TECHNICAL FIELD

The present invention relates to a Smith machine, and more particularly, to a Smith machine capable of adjusting the movement angle of a barbell manually or using an electric motor and thus performing muscle strength training while a training part is more subdivided.

BACKGROUND ART

Weight training machines may be classified into upper body training exercise machines and lower body training exercise machines, and these training machines are provided with weight bodies that may appropriately adjust weights according to a user, and thus muscle exercise of an upper body or a lower body of the user is performed by the weight bodies.

For example, a lower body exercise machine is an exercise machine that strengthens calf muscles and thigh muscles of the lower body of the user, and an upper body exercise machine is an exercise machine that strengthens back muscles or shoulder muscles of the user or strengthens arm muscles of the user.

A so-called Smith machine is present among these exercise machines and includes two support frames located to correspond to both sides thereof, a barbell bar hanging between the two support frames, and disc-shaped weight bodies fitted into ends of the barbell bar. The user exercises after fitting, into the ends of the barbell bar, the disc-shaped weight bodies corresponding to a weight that may be lifted by the user himself/herself.

The support frames only serve as a guide so that the barbell bar may be elevated.

In barbell exercise, a specific part of muscles may be stimulated according to an angle at which the barbell is lifted up. However, the existing Smith machine has a limitation in stimulating the muscles because the Smith machine is used while the angle thereof is fixed to a single angle.

In order to overcome this limitation, the present inventor applied Korean Patent Application No. 10-2016-0149279 titled “Smith machine capable of angle adjustment and swing.”

Meanwhile, the related application invention of the present inventor had a disadvantage in that due to the somewhat complicated configuration, the manufacturing costs increased, and the weight thereof was heavy.

RELATED ART DOCUMENT Patent Document

-   Patent Document 1: Korean Patent Application No. 10-2016-0149279

DISCLOSURE Technical Problem

The present invention is devised to improve the inventor's Korean Patent Application No. 10-2016-0149279 and is directed to providing a Smith machine capable of angle adjustment and swing that allows a frame for guiding elevation of a barbell bar to swing so that the effect of exercise may be changed according to a swing angle, and particularly, a Smith machine in which, by replacing a weight with a tensile elastic member, the volume may be reduced, a configuration may be simplified, and the stability may be improved when the swing angle is adjusted in a manual manner, and in addition, since the Smith machine may be used in an electric manner, a user may set the swing angle of the frame without effort, and furthermore, an exercise program that satisfies various exercise purposes may be applied.

Technical Solution

One aspect of the present invention provides a Smith machine including a frame part including two vertical pillars, a horizontal beam connecting upper ends of the two pillars, and support bases formed below the two pillars and configured to form an exercise space, a swing part formed in the exercise space and including a guide part having both columns hinge-coupled to both of the support bases, a support connecting upper ends of both of the columns, and rack bars formed in the columns, the guide part that is integrally coupled to the swing part to perform a swing operation together so as to guide raising or lowering of a barbell, an angle adjustment part for adjusting an angle of the swing part, and a barbell part coupled to the guide part to be vertically movable along the guide part, wherein the angle adjustment part includes a swing body driven in a manual manner or electrical manner and including an extension panel, which is fixed to an upper end of a shaft member of the swing part and vertically formed downward through a slit of the support base, and a bracket panel formed at a lower end of the extension panel, and a load support part in which a plurality of elastic members connected to the support base and the swing part are formed symmetrically to each other on both sides thereof and which compensates for a load change value and exerts a supporting force to prevent a sudden inclination when a swing angle of the swing part changes.

Advantageous Effects

According to the present invention, a Smith machine capable of angle adjustment and swing that allows a frame for guiding elevation of a barbell bar to swing so that the effect of exercise can be changed according to a swing angle is provided, and particularly, by replacing a weight with a tensile elastic member, the volume can be reduced, a configuration can be simplified, and the stability can be improved when the swing angle is adjusted in a manual manner, and in addition, since the Smith machine can be used in an electric manner, a user can set the swing angle of the frame without effort, furthermore, an exercise program that satisfies various exercise purposes can be applied.

DESCRIPTION OF DRAWINGS

FIGS. 1 and 2 are perspective views illustrating a Smith machine according to an embodiment.

FIG. 3 is a front view illustrating the Smith machine according to the embodiment.

FIG. 4 is a side view illustrating the Smith machine when a “swinging part (4)” is inclined at 90 degrees according to the embodiment.

FIG. 5 is a side view illustrating the Smith machine when the “swinging part (4)” is inclined at −25 degrees according to the embodiment.

FIG. 4 is a side view illustrating the Smith machine when the “swinging part (4)” is inclined at 115 degrees according to the embodiment.

FIG. 7 is a front view illustrating the Smith machine when a “stopper unit” is in a locked state according to the embodiment.

FIG. 8 is a front view illustrating the Smith machine when the “stopper unit” is in an unlocked state according to the embodiment.

FIG. 9 is a perspective view illustrating the “stopper unit” in the Smith machine according to another embodiment.

FIG. 10 is a front view illustrating a locked state of the stopper unit of FIG. 9.

FIG. 11 is a front view illustrating a unlocked state of the stopper unit of FIG. 9.

FIG. 12 is a perspective view illustrating a “bar weight compensation unit 5” in the Smith machine according to the embodiment.

FIG. 13 is a perspective view illustrating a locked state of a “low sensor” in the Smith machine according to the embodiment.

FIG. 14 is a perspective view illustrating an unlocked state of the “low sensor” in the Smith machine according to the embodiment FIG. 15 is a perspective view illustrating an electric Smith machine according to another embodiment.

FIGS. 16 and 17 are partially enlarged views of the electric Smith machine illustrated in FIG. 15.

DESCRIPTION OF REFERENCE NUMERALS

[Description of reference numerals] 2: Left and right vertical frame parts 4: Swing part 6: Guide part 7: Angle adjustment part 8: Barbell part 22: Left and right vertical pillars 24: Beam 26: Support base 42: Column 44: Rack bar 72: Swing body 74: Load support part C1, C2: Elastic member 5: Bar weight compensation unit 52: Elastic body 54: Wire 55: Second pulley 3: Stopper unit 31: Fixed handle 32: Operation handle 33: Connection piece 34: First fixing pin 35: Detection member 36: Low sensor 37: Rod 39: Second fixing pin L1: First link piece L2: Second link piece L3: Third link piece 75: First angle adjustment bracket 76: Second angle adjustment bracket M: Brake-type deceleration motor 110: Solenoid 120: Adjustment pin 200: Height detection unit 220: Pulley

MODES OF THE INVENTION

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, terms described below are defined in consideration of functions in the present invention, and it is specified that the terms should be interpreted as concepts consistent with the technical spirit of the present invention and meanings commonly used or generally recognized in the art.

Further, when it is determined that a detailed description of a widely known function or configuration related to the present invention may make the subject matter of the present invention unclear, the detailed description will be omitted.

Here, in the accompanying drawings, a part is illustrated in an exaggerated or simplified manner for convenience and clarity of description and understanding of a configuration and operation of the technology, and components do not exactly coincide with the actual sizes.

As illustrated in FIGS. 1 to 4, a Smith machine A1 capable of angle adjustment and swing according to an embodiment of the present invention includes a frame part 2 that includes two vertical pillars 22, a horizontal beam 24 connecting upper ends of the two pillars 22, and support bases 26 formed below the two pillars 22 and forms an exercise space, a swing part 4 which is formed in the exercise space, which performs a swing operation while being hinge-coupled to the support base 26 through a shaft member 41, and in which a rack bar 44 having a plurality of locking steps 442 is formed so that the height of a barbell bar 100 is adjusted, a guide part 6 which is integrally coupled to the swing part 4 to perform a swinging operation together so as to guide raising or lowering of the barbell bar 100, an angle adjustment part 7 for adjusting the angle of the swing part 4, and a barbell bar 100 coupled to the guide part 6 to be vertically movable along the guide part 6.

In the description of the present invention, since the left and right sides of a product are symmetrical to each other, only one side will be described.

The frame part 2 may include the two vertical pillars 22 and the horizontal beam 24 connecting the upper ends of the two pillars 22, and the support base 26 may be mounted in a “┐” shape on both lower sides thereof to provide a supporting force.

The swing part 4 includes vertical columns 42 hinge-coupled to both of the support bases 26 through the shaft members 41 and a support 43 for connecting the upper ends of both columns 42, and the guide part 6 having the rack bar 44 is included in each column 42.

An angle gauge 150 is formed at an end of the shaft member 41.

The angle gauge 150 is formed with a number and an indicator so that the inclination of the swing part 4 may be visually measured.

The guide part 6 is integrally coupled to the swing part 4 to perform a swing operation together so as to guide the raising or lowering of the barbell bar 100.

The guide part 6 includes a vertical elevation guide rod 62 parallel to the column 42 and a socket 64 coupled to the elevation guide rod 62 to be vertically elevated, the socket 64 is connected to the barbell bar 100, a hanger 102 is formed on one side of the barbell bar 100 and is coupled to any one of the plurality of locking steps 442 of the rack bar 44, and thus the height may be fixed.

The shaft member 41 protrudes from one side of the column 42, is formed horizontally, and is rotatably hinge-coupled to a bearing 412 of the support base 26.

The angle adjustment part 7 includes a swing body 72 including an extension panel 722 that has an upper end fixed to the shaft member 41 formed on one side of the column 42 of the swing part 4 and is formed vertically downward to pass through a slit 260 of the support base 26 and a bracket panel 724 formed at a lower end of the extension panel 722, and a load support part 74 that compensates for a load change value and exerts the supporting force to prevent a sudden inclination when a swing angle of the swing part 4 changes as a plurality of elastic members C1 and C2 connected to the support base 26 and the swing body 72 are formed symmetrically to each other on both sides.

In more detail, for convenience of description, the plurality of elastic members C1 and C2 are classified into first and second elastic members C1 and C2.

According to an example, the first elastic member C1 has one end fixed to a first holder 741 formed in the support base 26 and the other end fixed to and installed in a second holder 742 formed in the bracket panel 724 of the swing body 72.

The second elastic member C2 has one end fixed to a third holder 743 formed in the support base 26 and the other end connected to and installed in a fourth holder 744 formed in the bracket panel 724 of the swing body 72.

Thus, elastic forces are applied to the first and second elastic members C1 and C2 in directions opposite to each other, and thus complementary forces may be exerted when the angle of the swing part 4 rotates.

According to an embodiment, the first and second elastic members C1 and C2 are coil springs.

The first and second elastic members C1 and C2 may be installed so that middle parts thereof are wound around a roller 263 formed in the support base 26 and are thus bent.

Due to this bent shape, any one of the first and second elastic members C1 and C2 may be installed in an “L” shape or a “⊏” shape.

As illustrated in FIG. 1, the middle part of the first elastic member C1 is wound around the roller 263, and thus the first elastic member C1 is bent in an “L” shape.

The first and second elastic members C1 and C2 are not structurally connected to first and second angle adjustment brackets 75 and 76.

Thus, when the swing body 72 is inclined to one side, the elastic member C1 on the one side is contracted and the elastic member C2 on the other side is extended.

For this reason, a weight is compensated for the inclination of the swing part 4, and thus the angle may be easily adjusted even with one hand without effort.

Meanwhile, a low sensor 36 for detecting the lowest point of the barbell bar 100 is formed.

As illustrated in FIG. 13, the low sensor 36 includes a shaft 361 which has slots 362 a and 362 b formed on upper and lower sides thereof and includes a first operation piece 361 a longitudinally formed by coupling the upper slot 362 a and a pin p1 formed in the column 42 and a second operation piece 361 b longitudinally formed by coupling the lower slot 362 b and a pin p2 formed in the second column 42, a detection piece 366 which is formed on one side of the second operation piece 361 b at a right angle and in which the barbell bar 100 is in contact, and a detection member 35 which includes a guide shaft 352 longitudinally formed in a housing 351 mounted on the column 42, an elastic body 353 coupled to the guide shaft 352, and a socket 354 supported by the elastic body 353, coupled to the guide shaft 352 to operate vertically, and coupled to the detection piece 366.

The elastic body 353 of the detection member 35 always pushes the detection piece 366 and the shaft 361 upward.

A fitting protrusion 357 is formed outside the socket 354 and coupled to the housing 351.

The socket 354 is provided with a linear bearing 355 therein and coupled to the guide shaft 352.

The housing 351 is coupled to the column 42 in a welding manner, and the socket 354 does not rotate.

The elastic body 353 is a compression coil spring and always raises the socket 354 upward.

The socket 354 and the detection piece 366 are connected to each other. Thus, the housing 351 is always located at an upper point of the guide shaft 352.

Thus, when the barbell bar 100 is spaced apart from the detection piece 366, since the first operation piece 361 a and the second operation piece 361 b are raised, an upper end of the first operation piece 361 a overlaps a lower portion of a connection piece 33, and thus a current state is a locked state.

In this locked state, even when an operation handle 32 is pulled, the connection piece 33 is not moved, and thus the swing part 4 may be maintained in a locked state.

Meanwhile, as illustrated in FIG. 14, when the barbell bar 100 is placed on the detection piece 366, since the detection piece 366 and the first operation piece 361 a and the second operation piece 361 b connected thereto are lowered, the upper end of the first operation piece 361 a is separated from the connection piece 33, and thus the current state is an unlocked state.

Thus, in the unlocked state, since the connection piece 33 may be operated by pulling the operation handle 32, the angle of the swing part 4 may be operated.

Thus, only when the low sensor 36 detects the barbell bar 100, is the adjustment of the angle of the swing part 4 permitted, thereby ensuring the safety.

The adjustment of the angle of the swing part 4 will be described below.

Meanwhile, the Smith machine further includes bar weight compensation units 5 that are formed on both of the columns 42 and generate a load when the barbell bar 100 is raised.

As illustrated in FIG. 12, the bar weight compensation unit 5 includes an elastic body 52 embedded and mounted inside the column 42 in a longitudinal direction, a first pulley 53 formed at an inner lower end of the column 42 so that a lower portion of the elastic body 52 is wound therearound and the direction is switched to the upper side, a wire 54 connected to an end of the elastic body 52 facing upward, and a second pulley 55 formed in a protrusion (protrusion pipe for fixing an upper part of the elevation guide rod 62) of the column 42 so that the wire 54 is wound therearound, wherein the other end of the wire 54 is fixed to the barbell bar 100.

The elastic body 52 may be a coil spring having a predetermined length.

Thus, when the barbell bar 100 is raised, the elastic body 52 is contracted, but when the barbell bar 100 is lowered, the elastic body 52 is stretched, and thus the weight of the barbell bar 100 is reduced by half.

Alternatively, the elastic body 52 including a spiral spring instead of the coil spring having a predetermined length is mounted at a location of the second pulley 55, one end of the spiral spring is connected to a part of the barbell bar 100, and thus the weight of the barbell bar 100 may be simply reduced by half using an elastic rotational force of the spiral spring.

Meanwhile, the angle adjustment part 7 includes a stopper unit 3 that fixes or releases the swing part 4 at an inclined angle or a vertical angle so as to set a fixed state or a swingable state of the swing part 4.

As illustrated in FIG. 7, the stopper unit 3 includes a first link piece L1 that includes a fixed handle 31 formed on one side of the column 42, an operation handle 32 formed on one side of the fixed handle 31, and a connection piece 33 connected to the operation handle 32 and has one end fixed to the connection piece 33 and a middle portion hinge-coupled to the column 42 through a rotary shaft H2, a second link piece L2 that is coupled to a lower end of the first link piece L1 through a hinge H, has a middle portion hinge-coupled to the column 42 through a rotary shaft H3, and has a first fixing pin 34 formed at a lower end thereof, a rod 37 that has one end hinge-coupled to the first link piece L1 and is horizontally formed above the frame part 2, and a third link piece L3 that is hinge-coupled to the other end of the rod 37, has a middle portion hinge-coupled to the other column 42 through a rotary shaft H4, and has a second fixing pin 39 formed at a lower end thereof.

The second link piece L2 is connected, the rotary shaft H3 is located in the middle of the second link piece L2, the lower end of the second link piece L2 is connected to a pin end of the first fixing pin 34, an upper end of the second link piece L2 is hinge-coupled to the first link piece L1, and the rotary shaft H2 is coupled to the middle portion of the first link piece L1, which is like the second link piece L2.

Further, the first angle adjustment bracket 75 which is formed in a lower portion of the one column 42, in which a plurality of angle adjustment holes 750 are formed in an arc shape sharing a center with the shaft member 41 and to which the first fixing pin 34 is coupled, is provided.

Further, the second angle adjustment bracket 76 which is formed in a lower portion of the other column 42, in which a plurality of angle adjustment holes 760 are formed in an arc shape sharing a center with the shaft member 41 and to which the second fixing pin 39 is coupled, is provided.

A first guide member G1 having one open side so that the second link piece L2 is accommodated therein and having a space formed therein is formed on the one column 42.

A second guide member G2 having one open side so that the third link piece L3 is accommodated therein and having a space formed therein is formed on the other column 42.

The first and second guide members G1 and G2 have openings formed in directions in which the second link piece L2 and the third link piece L3 rotate, have the blocked other sides, and thus have “c”-shaped cross sections.

Thus, as illustrated in FIG. 11, when the operation handle 32 is pulled (in a leftward direction in FIG. 11), the connection piece is pulled, an upper portion of the second link piece L2 connected to the connection piece 33 rotates in a counterclockwise direction with respect to the drawing, and the first link piece L1 is interlocked with the second link piece L2 to rotate in a clockwise direction.

The first fixing pin 34 formed at the lower end of the second link piece L2 is spaced apart from the first angle adjustment bracket 75 and thus is in a free state.

At the same time, as the rod 37 interlocks with the clockwise rotation of the first link piece L1, the rod 37 moves to the right side, and as the third link piece L3 rotates in the clockwise direction, the lower second fixing pin 39 is spaced apart from the second angle adjustment bracket 76 and thus is in a free state.

In this way, the first fixing pin 34 and the second fixing pin 39 are spaced apart from the first angle adjustment bracket 75 and the second angle adjustment bracket 76, and thus the current state may be an unlocked state.

Meanwhile, when the operation handle 32 is pulled and then released, the operation handle 32 returns to an original location thereof.

Thus, the first fixing pin 34 and the second fixing pin 39 are always inserted into the angle adjustment holes 750 and 760 of the first and second angle adjustment brackets 75 and 76, and thus the angle of the swing part 4 may be fixed.

As illustrated in FIG. 17, the first fixing pin 34 and the second fixing pin 39 each include a housing 121, a shaft pin 122 coupled to an inside of the housing 121 and having one end coupled to a solenoid 110, a coil spring 123 coupled to the shaft pin 122, and a cover 124 coupled to block the housing 121.

Thus, when the operation handle 32 is pulled or the solenoid 110 is turned on, the shaft pin 122 is retracted and is thus separated from the angle adjustment holes 750 and 760 of the angle adjustment bracket 75 and 76, and when the operation handle 32 is pulled and then released or the solenoid is turned off, the shaft pin 122 is extracted and is thus inserted into and fixed to the angle adjustment holes 750 and 760 of the angle adjustment bracket 75 and 76.

Meanwhile, FIGS. 9 to 11 are views illustrating a stopper unit according to another embodiment.

A stopper unit 300 according to another embodiment is formed in an upper portion of a frame.

As illustrated in FIG. 9, the stopper unit 300 according to another embodiment includes a first link piece L1 that includes the fixed handle 31 formed on one side of the column 42, the operation handle 32 formed on one side of the fixed handle 31, and the connection piece 33 connected to the operation handle 32 and has one end fixed to the connection piece 33 and a middle portion hinge-coupled to the column 42 through a rotary shaft 311, an upper link piece 312 formed horizontally at an upper end of the first link piece 310, a holder 313 formed at the upper link piece 312 at a right angle, a first fixing pin 314 connected to the holder 313 and formed parallel to the upper link piece 312, and an angle adjustment bracket 340 which is fixedly installed at upper portions of both vertical pillars 22 of the frame part 2 and in which a plurality of angle adjustment holes 342 are formed so that the first fixing pin 314 is fitted therein.

Sine the angle adjustment bracket 340 is fixed to and mounted on an upper portion of the frame part 2, the Smith machine is firm and has small deformation and tolerance, a load applied to the angle adjustment hole 342 is low, and thus product lifetime is extended.

The first fixing pin 314 is inserted into a pin guide 316 so that the horizontal movement thereof is guided, a spring 315 is fitted in an outer circumferential surface of the first fixing pin 314, both sides of the spring 315 are supported by the pin guide 316 and a fixing bracket 317, and thus a force for pushing the first fixing pin 314 is applied.

Meanwhile, a second angle adjustment bracket 340 b may be formed by being spaced apart from the angle adjustment bracket 340 at a predetermined interval.

The second angle adjustment bracket 340 b is mounted on the upper portion of the opposite frame part 2.

A rod 370 that has one end hinge-coupled to an upper portion of the first link piece 310 and is horizontally formed on the support 43, a second link piece 320 that has one end hinge-coupled to the rod 370 and is mounted on the support 43 to be rotatable about a hinge shaft 321, and a second fixing pin 322 connected to the second link piece 320 are provided, and the second fixing pin 322 is thus fitted and coupled to the angle adjustment hole 342 of the second angle adjustment bracket 340 b, thereby exerting a fixing force.

As illustrated in FIG. 10, when the locked state is described, the first link piece 310 is in a vertical state in a state in which the operation handle 32 is not operated, and the upper first fixing pin 314 is in a fixed state of being fitted and coupled to the angle adjustment hole 342 of the first angle adjustment bracket 340.

Thereafter, as illustrated in FIG. 11, when a release operation is described, when the operation handle 32 is pulled (in a leftward direction), the connection piece 33 is pulled, the first link piece 310 connected to the connection piece 33 rotates about the hinge shaft 311, and the upper link piece 312 of the first link piece 310 moves rightward. Thus, the first fixing pin 314 connected thereto moves rearward and is separated from the angle adjustment hole 342 of the angle adjustment bracket 340, and thus the current state is a release state.

In addition, when the rod 370 moves rightward with reference to FIG. 11 to push a lower end of the second link piece 320, the second link piece 320 rotates about the hinge shaft 321, the second fixing pin 322 connected to an upper portion of the second link piece 320 is pulled leftward to be separated from the angle adjustment hole 342 of the second angle adjustment bracket 340 b, and thus the current state may be a release state.

Meanwhile, according to another embodiment, the load support part may be formed in an electrical manner.

As illustrated in FIG. 15, a load support part T according to another embodiment A2 includes a brake-type deceleration motor M connected to the left and right swing parts 4 and mounted on the support base 26 using a bracket 269, the first and second angle adjustment brackets 75 and 76 in which the angle adjustment holes 750 and 760 corresponding to a plurality of angles are formed, an adjustment pin 120 which is selectively fitted in the angle adjustment holes 750 and 769 and on which the solenoid 110 is mounted, and an encoder (not illustrated) formed inside the brake-type deceleration motor M.

Further, the load support part T includes an electric angle adjustment part that identifies a current angle of the swing part 4 by driving the brake-type deceleration motor M and an operation panel 78 that operates a manual and a program.

Further, as illustrated in FIG. 16, the load support part T includes a clutch unit M-2 that may selectively connect or separate the brake-type deceleration motor M to or from a lower end of the swing part 4.

The clutch unit M-2 may be connected or disconnected according to a control signal of the operation panel 78.

Meanwhile, a pulley 220 that is pressed against one of the left and right elevation guide rods 62 that guide the barbell bar 100 when the barbell bar 100 moves upward or downward and rotates when the barbell bar 100 is elevated and a height detection unit 200 including the encoder formed inside the pulley 220 are formed.

Thus, the encoder (not illustrated) formed inside the pulley 220 identifies the current height of the barbell bar 100.

When the user sets an electric mode in the operation panel 78, the clutch unit M-2 is turned on, and thus the brake-type deceleration motor M is connected to the lower end of the swing part 4.

Thereafter, when the angle is adjusted on the operation panel 78, the solenoid 110 located behind the adjustment pin 120 is operated. Thus, the adjustment pin 120 is separated from the angle adjustment brackets 75 and 76, and at the same time, the brake-type deceleration motor M rotates at the corresponding angle.

Thereafter, when the angle is adjusted to an appropriate angle, the brake-type deceleration motor M stops, and the solenoid 110 fixedly inserts the adjustment pin 120 into the angle adjustment holes 750 and 760 of the angle adjustment brackets 75 and 76.

The adjustment pin 120 includes the housing 121, the shaft pin 122 coupled to the inside of the housing 121 and having one end coupled to the solenoid 110, the coil spring 123 coupled to the shaft pin 122, and the cover 124 coupled to block the housing 121.

Thus, when the solenoid 110 is turned on, the shaft pin 122 is retracted and is thus separated from the angle adjustment holes 750 and 760 of the angle adjustment brackets 75 and 76, and when the solenoid 110 is turned off, the shaft pin 122 is extracted and is thus fixedly inserted onto the angle adjustment holes 750 and 760 of the angle adjustment brackets 75 and 76.

The brake-type deceleration motor M has a brake formed therein, and when the brake-type deceleration motor M rotates, the brake does not perform its function, and when the rotation of the brake-type deceleration motor M stops, the brake performs its function to firmly fix the angle of the swing part 4.

When the user uses a program method, the electric angle adjustment part may control the barbell bar 100 to freely move in a C or S shape by changing the angle of the swing part 4 according to a height point of the barbell bar 100 by program control.

The user may make, store, and use various programs suitable for the purpose of exercise and may directly make a program.

For example, when the user performs a bench press for chest exercise, the angle of the barbell bar 100 may be automatically adjusted from a flat bench angle at a starting point via an incline angle in a middle point and to a decline angle at the highest point.

When it is assumed that a rotation angle of the swing part 4 is changed in units of 5 degrees, the rotation angle is initially maintained at 90 degrees, is then reduced to 25 degrees in increments of 5 degrees so that an incline bench press may be performed, and is then increased to 115 degrees so that a decline bench press may be performed.

When the angle is changed, the encoder in the brake-type deceleration motor M and the encoder in the pulley 220 pressed against the elevation guide rod 62 identify the angle of the swing part 4 and the height of a barbell, and while the solenoid 110 located behind the adjustment pin 120 maintains the adjustment pin 120 in a separated state, the brake-type deceleration motor M is driven, and thus the swing part 4 rotates as a whole.

Meanwhile, after use, the solenoid 110 returns to an original location thereof at a set angle, inserts the adjustment pin 120 into the angle adjustment brackets 75 and 76, and fixes the angle of the swing part 4.

Meanwhile, the present invention is not limited by the above-described embodiments and the accompanying drawings, and various modifications and applications not exemplified without departing from the technical spirit of the present invention are possible, and components may be substituted and the present invention may be changed to equivalent other embodiments. Thus, it should be interpreted that contents related to modifications and applications of the features of the present invention are included in the scope of the present invention. 

1. A Smith machine comprising: a frame part including two vertical pillars, a horizontal beam connecting upper ends of the two pillars, and support bases formed below the two pillars and configured to form an exercise space; a swing part formed in the exercise space and including a guide part having both columns hinge-coupled to both of the support bases, a support connecting upper ends of both of the columns, and rack bars formed in the columns; the guide part that is integrally coupled to the swing part to perform a swing operation together so as to guide raising or lowering of a barbell; an angle adjustment part for adjusting an angle of the swing part; and a barbell part coupled to the guide part to be vertically movable along the guide part, wherein the angle adjustment part includes: a swing body driven in a manual manner or electrical manner and including an extension panel, which is fixed to an upper end of a shaft member of the swing part and vertically formed downward through a slit of the support base, and a bracket panel formed at a lower end of the extension panel; and a load support part in which a plurality of elastic members connected to the support base and the swing part are formed symmetrically to each other on both sides thereof and which compensates for a load change value and exerts a supporting force to prevent a sudden inclination when a swing angle of the swing part changes.
 2. The Smith machine of claim 1, wherein the load support part includes: a first elastic member that has one end fixed to a first holder formed in the support base and the other end fixed to a second holder formed in the bracket panel; and a second elastic member that has one end fixed to a third holder formed in the support base and the other end fixed to a fourth holder formed in the bracket panel, and any one of the first elastic member and the second elastic member has a middle part wound and bent on a roller formed in the support base to form an “L” shape or a “⊏” shape, and the first elastic member and the second elastic member are formed to be symmetrical to each other.
 3. The Smith machine of claim 1, wherein a low sensor that detects a lowermost point of the barbell is formed, only when the low sensor detects the barbell, is adjustment of an angle of the swing part permitted, the low sensor includes: a shaft having slots formed at upper and lower portions thereof and including a first operation piece formed in a longitudinal direction by coupling the upper slot and a pin formed in the column and a second operation piece formed in the longitudinal direction by coupling the lower slot of the first operation piece and the pin formed in the column; a detection piece that is formed on one side of the second operation piece at a right angle and is in contact with a barbell bar; and a detection member that includes a guide shaft formed in a housing mounted on the column in the longitudinal direction, an elastic body coupled to the guide shaft, and a socket supported by the elastic body, coupled to the guide shaft to vertically operate, and coupled to the detection piece, a fitting protrusion is formed outside the socket and coupled to the housing to prevent rotation, the elastic body of the detection member always pushes the detection piece and the shaft upward, and when the barbell bar is spaced apart from the detection piece, the first operation piece and the second operation piece are raised, and an upper end of the first operation piece is pressed against an outer surface of a connection piece so that a current state is a locked state.
 4. The Smith machine of claim 1, further comprising bar weight compensation units formed in both of the columns to generate a load when a barbell bar rises, wherein each of the bar weight compensation units includes: an elastic body embedded and mounted inside the column in a longitudinal direction; a first pulley formed at an inner lower end of the column so that a lower portion of the elastic body is wound therearound and a direction is switched to an upward direction; a wire connected to an end of the elastic body facing upward; and a second pulley formed on an upper support so that the wire is wound therearound, and the other end of the wire is fixed to the barbell bar
 5. The Smith machine of claim 1, wherein the lower support part includes: a brake-type deceleration motor connected to a rotary shaft of the swing part; a clutch unit that selectively connects or separates the brake-type deceleration motor to or from a lower end of the swing part; an angle adjustment bracket having through-holes formed therein to correspond to a plurality of angles; an adjustment pin which is selectively fitted in the through-holes and on which a solenoid is mounted; an encoder that is formed inside the brake-type deceleration motor and detects a current inclination angle of the swing part; an electric angle adjustment unit that controls an operation of the clutch unit and identifies a current angle of the swing part by driving the brake-type deceleration motor; and an operation panel that operates a manual and a program.
 6. The Smith machine of claim 5, wherein the electric angle adjustment unit changes an angle of the swing part according to a height point of the barbell according to program control so that the barbell moves at various angles like a “C” shape or an “S” shape.
 7. The Smith machine of claim 1, wherein the angle adjustment unit further includes a stopper unit that fixes or unfixes the swing part at an inclined angle or a vertical angle so as to set a fixed state or a swingable state of the swing part.
 8. The Smith machine of claim 7, wherein the stopper unit includes: a first link piece including a fixed handle formed in the column, an operation handle formed in the fixed handle, and a connection piece connected to the operation handle and having one end fixed to the connection piece and a middle portion hinge-coupled to the column; a second link piece hinge-coupled to a lower end of the first link piece and having a middle portion hinge-coupled to the column and a first fixing pin formed at a lower end thereof; a rod having one end hinge-coupled to the first link piece and horizontally formed above the frame part; and a third link piece hinge-coupled to the rod and having a middle portion hinge-coupled to the other column and a second fixing pin formed at a lower end thereof.
 9. The Smith machine of claim 7, wherein the stopper unit includes: a fixed handle formed in the column; an operation handle formed in the fixed handle; a connection piece connected to the operation handle; a first link piece having one end fixed to the connection piece and a middle portion hinge-coupled to the column; an upper link piece horizontally formed at an upper end of the first link piece; a holder formed in the upper link piece at a right angle; a first fixing pin connected to the holder and formed to be parallel to the upper link piece; and an angle adjustment bracket fixedly installed above the vertical pillar of the frame part and having a plurality of angle adjustment holes formed therein so that the first fixing pin is fitted therein.
 10. The Smith machine of claim 5, wherein the adjustment pin includes a housing, a shaft pin coupled to an inside of the housing and having one end coupled to the solenoid, a coil spring coupled to the shaft pin, and a cover coupled to block the housing. 